====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/31774 is trying to acquire lock: 00000000ae785ece (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2750 [inline] 00000000ae785ece (&sig->cred_guard_mutex){+.+.}, at: proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 but task is already holding lock: 0000000016c78cd8 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: seq_read+0x6b/0x11c0 fs/seq_file.c:164 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_xattr_set+0x53/0x600 fs/overlayfs/inode.c:338 __vfs_setxattr+0x10e/0x170 fs/xattr.c:149 __vfs_setxattr_noperm+0x11a/0x420 fs/xattr.c:180 __vfs_setxattr_locked+0x176/0x250 fs/xattr.c:238 vfs_setxattr+0xe5/0x270 fs/xattr.c:255 setxattr+0x23d/0x330 fs/xattr.c:520 path_setxattr+0x170/0x190 fs/xattr.c:539 __do_sys_lsetxattr fs/xattr.c:561 [inline] __se_sys_lsetxattr fs/xattr.c:557 [inline] __x64_sys_lsetxattr+0xbd/0x150 fs/xattr.c:557 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&sig->cred_guard_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &sig->cred_guard_mutex --> sb_writers#3 --> &p->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->lock); lock(sb_writers#3); lock(&p->lock); lock(&sig->cred_guard_mutex); *** DEADLOCK *** 2 locks held by syz-executor.0/31774: #0: 00000000884f6d85 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 0000000016c78cd8 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 stack backtrace: CPU: 0 PID: 31774 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f7a168ac109 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7a15200168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f7a169bf030 RCX: 00007f7a168ac109 RDX: 0000000000002020 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f7a1690605d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc2a89ee1f R14: 00007f7a15200300 R15: 0000000000022000 ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 netlink: 76 bytes leftover after parsing attributes in process `syz-executor.0'. connect: ipv4 mapped netlink: 76 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 76 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 76 bytes leftover after parsing attributes in process `syz-executor.0'. connect: ipv4 mapped connect: ipv4 mapped audit: type=1804 audit(1656648178.822:357): pid=32082 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir1304010015/syzkaller.QE9yex/53/file0/bus" dev="loop2" ino=149 res=1 attempt to access beyond end of device loop2: rw=2049, want=112, limit=15 attempt to access beyond end of device loop2: rw=2049, want=121, limit=15 attempt to access beyond end of device loop2: rw=2049, want=122, limit=15 buffer_io_error: 12 callbacks suppressed Buffer I/O error on dev loop2, logical block 121, lost async page write attempt to access beyond end of device loop2: rw=2049, want=123, limit=15 Buffer I/O error on dev loop2, logical block 122, lost async page write attempt to access beyond end of device loop2: rw=2049, want=124, limit=15 Buffer I/O error on dev loop2, logical block 123, lost async page write attempt to access beyond end of device loop2: rw=2049, want=125, limit=15 Buffer I/O error on dev loop2, logical block 124, lost async page write attempt to access beyond end of device loop2: rw=2049, want=126, limit=15 Buffer I/O error on dev loop2, logical block 125, lost async page write attempt to access beyond end of device loop2: rw=2049, want=127, limit=15 Buffer I/O error on dev loop2, logical block 126, lost async page write attempt to access beyond end of device loop2: rw=2049, want=128, limit=15 Buffer I/O error on dev loop2, logical block 127, lost async page write audit: type=1804 audit(1656648179.612:358): pid=32155 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir2038566320/syzkaller.tpprew/392/bus" dev="sda1" ino=15169 res=1 attempt to access beyond end of device audit: type=1804 audit(1656648179.742:359): pid=32196 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/347/file0/bus" dev="loop1" ino=150 res=1 loop1: rw=2049, want=72, limit=15 attempt to access beyond end of device attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 loop2: rw=2049, want=64, limit=15 attempt to access beyond end of device attempt to access beyond end of device loop2: rw=2049, want=65, limit=15 loop1: rw=2049, want=122, limit=15 Buffer I/O error on dev loop1, logical block 121, lost async page write attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 Buffer I/O error on dev loop1, logical block 122, lost async page write attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 Buffer I/O error on dev loop1, logical block 123, lost async page write attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 audit: type=1804 audit(1656648179.832:360): pid=32201 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.2" name="/root/syzkaller-testdir1304010015/syzkaller.QE9yex/55/file0/bus" dev="loop2" ino=151 res=1 attempt to access beyond end of device loop2: rw=2049, want=66, limit=15 attempt to access beyond end of device loop2: rw=2049, want=67, limit=15 attempt to access beyond end of device loop2: rw=2049, want=68, limit=15 attempt to access beyond end of device loop2: rw=2049, want=69, limit=15 attempt to access beyond end of device loop2: rw=2049, want=70, limit=15 attempt to access beyond end of device loop2: rw=2049, want=72, limit=15 attempt to access beyond end of device loop2: rw=2049, want=73, limit=15 attempt to access beyond end of device loop2: rw=2049, want=121, limit=15 attempt to access beyond end of device loop2: rw=2049, want=122, limit=15 attempt to access beyond end of device loop2: rw=2049, want=123, limit=15 attempt to access beyond end of device loop2: rw=2049, want=124, limit=15 attempt to access beyond end of device loop2: rw=2049, want=125, limit=15 attempt to access beyond end of device loop2: rw=2049, want=126, limit=15 attempt to access beyond end of device loop2: rw=2049, want=127, limit=15 attempt to access beyond end of device loop2: rw=2049, want=128, limit=15 audit: type=1804 audit(1656648180.352:361): pid=32253 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/348/file0/bus" dev="loop1" ino=152 res=1 attempt to access beyond end of device loop1: rw=2049, want=88, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 audit: type=1804 audit(1656648181.072:362): pid=32347 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/349/file0/bus" dev="loop1" ino=153 res=1 audit: type=1804 audit(1656648181.482:363): pid=32398 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/350/file0/bus" dev="loop1" ino=155 res=1 attempt to access beyond end of device loop1: rw=2049, want=88, limit=15 attempt to access beyond end of device loop1: rw=2049, want=89, limit=15 attempt to access beyond end of device loop1: rw=2049, want=90, limit=15 attempt to access beyond end of device loop1: rw=2049, want=91, limit=15 attempt to access beyond end of device loop1: rw=2049, want=93, limit=15 attempt to access beyond end of device loop1: rw=2049, want=94, limit=15 attempt to access beyond end of device loop1: rw=2049, want=95, limit=15 attempt to access beyond end of device loop1: rw=2049, want=96, limit=15 attempt to access beyond end of device loop1: rw=2049, want=97, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 audit: type=1804 audit(1656648182.122:364): pid=32447 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/351/file0/bus" dev="loop1" ino=156 res=1 attempt to access beyond end of device loop1: rw=2049, want=64, limit=15 attempt to access beyond end of device loop1: rw=2049, want=65, limit=15 attempt to access beyond end of device loop1: rw=2049, want=66, limit=15 attempt to access beyond end of device loop1: rw=2049, want=68, limit=15 attempt to access beyond end of device loop1: rw=2049, want=69, limit=15 attempt to access beyond end of device loop1: rw=2049, want=70, limit=15 attempt to access beyond end of device loop1: rw=2049, want=71, limit=15 attempt to access beyond end of device loop1: rw=2049, want=72, limit=15 attempt to access beyond end of device loop1: rw=2049, want=73, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 audit: type=1804 audit(1656648182.712:365): pid=32499 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/352/file0/bus" dev="loop1" ino=157 res=1 attempt to access beyond end of device loop1: rw=2049, want=104, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 audit: type=1804 audit(1656648183.222:366): pid=32515 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir2038566320/syzkaller.tpprew/406/bus" dev="sda1" ino=15217 res=1 attempt to access beyond end of device loop1: rw=2049, want=80, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 kauditd_printk_skb: 1 callbacks suppressed audit: type=1804 audit(1656648183.832:368): pid=32583 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/354/file0/bus" dev="loop1" ino=159 res=1 attempt to access beyond end of device loop1: rw=2049, want=64, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 buffer_io_error: 70 callbacks suppressed Buffer I/O error on dev loop1, logical block 121, lost async page write attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 Buffer I/O error on dev loop1, logical block 122, lost async page write attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 Buffer I/O error on dev loop1, logical block 123, lost async page write attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 Buffer I/O error on dev loop1, logical block 124, lost async page write attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 Buffer I/O error on dev loop1, logical block 125, lost async page write attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 Buffer I/O error on dev loop1, logical block 126, lost async page write attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 Buffer I/O error on dev loop1, logical block 127, lost async page write audit: type=1804 audit(1656648184.482:369): pid=32632 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/355/file0/bus" dev="loop1" ino=160 res=1 attempt to access beyond end of device loop1: rw=2049, want=88, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 Buffer I/O error on dev loop1, logical block 121, lost async page write attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 Buffer I/O error on dev loop1, logical block 122, lost async page write attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 Buffer I/O error on dev loop1, logical block 123, lost async page write attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 À: renamed from ip6_vti0 audit: type=1804 audit(1656648185.152:370): pid=32682 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir2563972977/syzkaller.HYrkWD/356/file0/bus" dev="loop1" ino=161 res=1 attempt to access beyond end of device loop1: rw=2049, want=72, limit=15 attempt to access beyond end of device loop1: rw=2049, want=73, limit=15 attempt to access beyond end of device loop1: rw=2049, want=75, limit=15 attempt to access beyond end of device loop1: rw=2049, want=76, limit=15 attempt to access beyond end of device loop1: rw=2049, want=77, limit=15 attempt to access beyond end of device loop1: rw=2049, want=78, limit=15 attempt to access beyond end of device loop1: rw=2049, want=79, limit=15 attempt to access beyond end of device loop1: rw=2049, want=80, limit=15 attempt to access beyond end of device loop1: rw=2049, want=81, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 attempt to access beyond end of device loop1: rw=2049, want=80, limit=15 attempt to access beyond end of device loop1: rw=2049, want=81, limit=15 attempt to access beyond end of device loop1: rw=2049, want=82, limit=15 attempt to access beyond end of device loop1: rw=2049, want=83, limit=15 attempt to access beyond end of device loop1: rw=2049, want=84, limit=15 attempt to access beyond end of device loop1: rw=2049, want=85, limit=15 attempt to access beyond end of device loop1: rw=2049, want=86, limit=15 attempt to access beyond end of device loop1: rw=2049, want=87, limit=15 attempt to access beyond end of device loop1: rw=2049, want=89, limit=15 attempt to access beyond end of device loop1: rw=2049, want=121, limit=15 attempt to access beyond end of device loop1: rw=2049, want=122, limit=15 attempt to access beyond end of device loop1: rw=2049, want=123, limit=15 attempt to access beyond end of device loop1: rw=2049, want=124, limit=15 attempt to access beyond end of device loop1: rw=2049, want=125, limit=15 attempt to access beyond end of device loop1: rw=2049, want=126, limit=15 attempt to access beyond end of device loop1: rw=2049, want=127, limit=15 attempt to access beyond end of device loop1: rw=2049, want=128, limit=15 attempt to access beyond end of device loop1: rw=2049, want=104, limit=15